▎ 摘　　要

NOVELTY - Preparing graphene in closed static system involves providing a substrate, where substrate comprising a catalyst. The substrate is placed in a sealed reaction chamber, and a carbon source, a hydrogen gas, and a shielding gas are introduced into the sealed reaction chamber to a set pressure to form a closed static system, and the closed static system is heated to 800-1060 degrees C, the carbon source is sufficiently contacted with the catalyst to carry out a high temperature catalytic decomposition reaction to grow graphene on the surface and/or inside of the substrate. USE - Method for preparing graphene in closed static system used for the preparation of integrated circuits, optoelectronic devices, and sensors or solar cells (claimed). ADVANTAGE - The method enables to prepare graphene in closed static system which has wide application prospect.